Physical vs Chemical Changes Whats the Difference l

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Physical vs. Chemical Changes

Physical vs. Chemical Changes

What’s the Difference? l l l Matter can change Examples: Freeze, cut, burn, etc.

What’s the Difference? l l l Matter can change Examples: Freeze, cut, burn, etc. 2 types of changes 1. 2. Physical changes Chemical changes

Physical Changes l Matter changes form WITHOUT becoming something new – l You start

Physical Changes l Matter changes form WITHOUT becoming something new – l You start and end with same thing (see below) Examples: cutting, freezing, melting, etc.

Molecules in Physical Changes

Molecules in Physical Changes

Chemical Changes l Matter changes, becomes NEW substance – l l Start and end

Chemical Changes l Matter changes, becomes NEW substance – l l Start and end with different things Usually irreversible (can’t change back) Examples: burning, rusting, milk going sour

Molecules in Chemical Changes l The atoms arrange to make a new substance

Molecules in Chemical Changes l The atoms arrange to make a new substance

Chemical Change = Reaction l Reactants: starting solutions in a reaction l Products: the

Chemical Change = Reaction l Reactants: starting solutions in a reaction l Products: the resulting solutions in a reaction

Signs of Change l Physical – – – Size Shape Texture l Chemical –

Signs of Change l Physical – – – Size Shape Texture l Chemical – – – Temperature Color Bubbles/fizzing Smoke Smell

Chemical Reaction Demo Na. HCO 3 + HOOCCH 3 l Baking Soda and Vinegar

Chemical Reaction Demo Na. HCO 3 + HOOCCH 3 l Baking Soda and Vinegar Na. OOCCH 3 + H 2 O + CO 2 Sodium Acetate, water, and carbon dioxide

Is it a chemical or physical change? l Sugar dissolving in tea • Chemical

Is it a chemical or physical change? l Sugar dissolving in tea • Chemical Change • Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Correct!

Is it a chemical or physical change? l Logs burning • Chemical Change •

Is it a chemical or physical change? l Logs burning • Chemical Change • Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Correct!

Is it a chemical or physical change? l Breaking water up by separating it

Is it a chemical or physical change? l Breaking water up by separating it into hydrogen and oxygen • Chemical Change • Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Correct!

Is it a chemical or physical change? l Cutting paper • Chemical Change •

Is it a chemical or physical change? l Cutting paper • Chemical Change • Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Correct!

Is it a chemical or physical change? l Crushing an aspirin • Chemical Change

Is it a chemical or physical change? l Crushing an aspirin • Chemical Change • Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Correct!

Is it a chemical or physical change? l Metal rusting • Chemical Change •

Is it a chemical or physical change? l Metal rusting • Chemical Change • Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Correct!

Is it a chemical or physical change? l An egg rotting • Chemical Change

Is it a chemical or physical change? l An egg rotting • Chemical Change • Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Correct!

Is it a chemical or physical change? l An egg breaking • Chemical Change

Is it a chemical or physical change? l An egg breaking • Chemical Change • Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Correct!

Physical Change v. Chemical Change Make a Venn Diagram to compare the 2 types

Physical Change v. Chemical Change Make a Venn Diagram to compare the 2 types of changes

Chemical and Physical Changes Chemical Changes Chemical changesChemical and Physical Changes Chemical Changes Chemical changes
Physical and Chemical Changes Physical Changes Physical changesPhysical and Chemical Changes Physical Changes Physical changes
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Physical Properties Physical Changes Chemical Properties Chemical ChangesPhysical Properties Physical Changes Chemical Properties Chemical Changes
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Chemical Changes 1 Review Chemical and Physical ChangesChemical Changes 1 Review Chemical and Physical Changes
Chemical Changes in Matter Physical Vs Chemical ChangesChemical Changes in Matter Physical Vs Chemical Changes
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Physical and Chemical CHANGES Physical changes are allPhysical and Chemical CHANGES Physical changes are all
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Physical and Chemical Changes Physical Changes The appearancePhysical and Chemical Changes Physical Changes The appearance
Physical Chemical Changes Physical Changes Only alter thePhysical Chemical Changes Physical Changes Only alter the
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